package servlet;

import dao.BookDAO;
import pojo.Book;
import pojo.Review;
import dao.ReviewDAO;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;

@WebServlet("/addReview")
public class ReviewAddServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    // 上传文件存储目录
    private static final String UPLOAD_DIRECTORY = "upload";

    // 上传配置
    private static final int MEMORY_THRESHOLD   = 1024 * 1024 * 3;  // 3MB
    private static final int MAX_FILE_SIZE      = 1024 * 1024 * 40; // 40MB
    private static final int MAX_REQUEST_SIZE   = 1024 * 1024 * 50; // 50MB


    /**
     * 上传数据及保存文件
     */
    protected void doPost(HttpServletRequest request,
                          HttpServletResponse response) throws ServletException, IOException {

        request.setCharacterEncoding("utf-8");
        response.setContentType("text/html; charset=UTF-8");

        System.out.println("review~");
        // 检测是否为多媒体上传
        if (!ServletFileUpload.isMultipartContent(request)) {
            // 如果不是则停止
            PrintWriter writer = response.getWriter();
            writer.println("Error: 表单必须包含 enctype=multipart/form-data");
            writer.flush();
            return;
        }

        // 配置上传参数
        DiskFileItemFactory factory = new DiskFileItemFactory();
        // 设置内存临界值 - 超过后将产生临时文件并存储于临时目录中
        factory.setSizeThreshold(MEMORY_THRESHOLD);
        // 设置临时存储目录
        factory.setRepository(new File(System.getProperty("java.io.tmpdir")));

        ServletFileUpload upload = new ServletFileUpload(factory);

        // 设置最大文件上传值
        upload.setFileSizeMax(MAX_FILE_SIZE);

        // 设置最大请求值 (包含文件和表单数据)
        upload.setSizeMax(MAX_REQUEST_SIZE);

        // 中文处理
        upload.setHeaderEncoding("UTF-8");

        // 构造临时路径来存储上传的文件
        String uploadPath = getServletContext().getRealPath("/") + UPLOAD_DIRECTORY;

        // 如果目录不存在则创建
        File uploadDir = new File(uploadPath);
        if (!uploadDir.exists()) {
            uploadDir.mkdir();
        }

        String url = null;

        try {
            // 解析请求的内容提取文件数据
            @SuppressWarnings("unchecked")
            List<FileItem> formItems = upload.parseRequest(request);
            System.out.println(formItems);

            if (formItems != null && formItems.size() > 0) {
                Review review = new Review();

                // 迭代表单数据
                for (FileItem item : formItems) {
                    if (!item.isFormField()) {
                        if (item.getName().equals("")){
                            System.out.println("null!!!!");
                            continue;
                        }

                        // 处理不在表单中的字段
                        String fileName = new File(item.getName()).getName();
                        String filePath = uploadPath + File.separator + fileName;//用于写入磁盘
                        File storeFile = new File(filePath);

                        // 保存文件到硬盘
                        item.write(storeFile);
                        request.setAttribute("message", "文件上传成功!");

                        //存储相对路径到数据库
                        String filePath4sql = request.getContextPath() + "/" + UPLOAD_DIRECTORY + "/" +fileName;
                        review.setImg(filePath4sql);

                        // 在控制台输出文件的上传路径和相对路径
                        System.out.println(filePath);
                        System.out.println(filePath4sql);
                    }
                    else{
                        //如果是普通表单字段
                        if("st_id".equals(item.getFieldName())){
                            review.setSt_id(Integer.parseInt(item.getString("UTF-8")));
                        }
                        else if("st_name".equals(item.getFieldName())){
                            review.setSt_name(item.getString("UTF-8"));
                        }
                        else if("bk_id".equals(item.getFieldName())){
                            review.setBk_id(Integer.parseInt(item.getString("UTF-8")));
                            Book book = new BookDAO().getBookById(Integer.parseInt(item.getString("UTF-8")));
                            book.setDiscuss(book.getDiscuss()+1);
                            try {
                                new BookDAO().updateDiscuss(book, Integer.parseInt(item.getString("UTF-8")));
                            } catch (Exception e) {
                                e.printStackTrace();
                            }
                        }
                        else if("time".equals(item.getFieldName())){
                            review.setTime(item.getString("UTF-8"));
                        }
                        else if("type".equals(item.getFieldName())){
                            review.setType(item.getString("UTF-8"));
                        }
                        else if("title".equals(item.getFieldName())){
                            review.setTitle(item.getString("UTF-8"));
                        }
                        else if("content".equals(item.getFieldName())){
                            review.setContent(item.getString("UTF-8"));
                        }
                        else if("url".equals(item.getFieldName())){
                            url = item.getString("UTF-8");
                        }
                    }

                }
                new ReviewDAO().add(review);
            }
        } catch (Exception ex) {
            request.setAttribute("message",
                    "错误信息: " + ex.getMessage());
        }

        // 重定向 list.jsp
        response.sendRedirect(url);
    }

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doPost(req, resp);
    }
}